Koss ESP-9 specifications

Brand: Koss

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• Type: electrostatic headphone
• Drive units:
• Impedance: 4-16Ω
• Frequency Response: 15Hz to 15kHz
• Input:
• Maximum SPL:
• Distortion: 0.2%
• Cord length: 2000mm
• Weight: 19 ozs
• Price:
• Year: 1969